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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffb2f54616dc3bbf5fcf70f49f41f5a1b32f326ecd0d365a7a08865ce4b031a' 
  AND token = 'CpPUIeGqgCcuah7Fer4WACtYh13drsOK81iG+LmroKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}